Free Online Tool
Ohms Law Calculator
Use the V=I×R relationship to calculate common circuit values directly in your browser.
The result will appear here.
How to Use
- Enter any two values among voltage, current, resistance, and power.
- Click calculate.
- Review the remaining values with units.
Examples
- Calculate 250Ω from 5V and 0.02A
- Calculate 2A and 24W from 12V and 6Ω
Calculation and Conversion Notes
The calculation is based on Ohm's law, `V = I × R`. Power uses `P = V × I`, `P = V^2 / R`, and `P = I^2 × R`. The tool calculates the remaining values from the combination of values you enter.
FAQ
Does Ohms Law Calculator save my input?
No. Your input is not stored on a server. Supported actions run in your browser.
Can I use it on mobile?
Yes. The pages are responsive and work on desktop and mobile browsers.
Can I rely on the result?
Use the result as a quick reference. Important work should be checked separately.